UnInstalling Previous Beta SP3 installs: Uninstall information for the Windows XP SP3 Releases. To uninstall Windows XP SP3, follow these steps:
1. Click Start, click Run, type appwiz.cpl, and then click OK. 2. Click Change or Remove Programs. 3. Click Windows XP Service Pack 3 (936929), and then click Remove. 4. Restart the computer